Description
Return one color-coordinate difference and weighted square.
Illuminance, accumulated light exposure, polarization and color-coordinate differences are different optical quantities. Lux-hours combine illuminance and duration; one coordinate difference does not describe a complete color difference or an object’s susceptibility to damage. Optical and preservation interpretation require suitable calibration and material context.
Return one color-coordinate difference and weighted square.
When to use this tool
Use Conservation Color Difference Single Coordinate when checking the stated illumination, exposure or optical-coordinate term.
How to use the tool and how it works
- Enter reference, observed, weight. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read difference, weightedSquare. Use the output convention below.
Return one color-coordinate difference and weighted square. Require weight >= 0; difference = observed-reference, weightedSquare = weight*difference².1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| reference | Caller-supplied comparison value in the same units as the observed quantity. | Required. Finite number. |
| observed | Observed | Required. Finite number. |
| weight | Weight | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| difference | Difference | Required. Finite number. |
| weightedSquare | Weighted Square | Required. Finite number. |
{
"input": {
"reference": 50,
"observed": 53,
"weight": 2
},
"output": {
"difference": 3,
"weightedSquare": 18
}
}Limitations and assumptions
- This is one supplied coordinate contribution, not a complete perceptual color-difference metric, calibration or condition assessment.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use calibrated lighting/color measurements and an object-specific conservation assessment for display limits, color fidelity or deterioration risk.
References
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